Cement should have a high brand. Having bought cement, it must be used for 6 months.
Sand is desirable to use river or lake (grain size 0.2-5 mm).
From crushed stone, cement and sand you need to make concrete for the foundation at home. Cement, clay and sand are used for a solution that is used to put the basement. To shut up concrete, you can use tap or natural water, but not in any case, waste water, which contains acids or fats. We use roofing only for vapor barrier of walls and floors, for insulation of the basement from water. The roof of the house is covered with asbestos -cement wavy sheets.
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